patch 8.2.1345: Redraw error when using visual block and scroll Commit: https://github.com/vim/vim/commit/f8992d47cd50494c64bb733329067c9de3c75200 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Aug 1 19:14:13 2020 +0200 patch 8.2.1345: Redraw error when using visual block and scroll Problem: Redraw error when using visual block and scroll. Solution: Add check for w_topline. ( closes https://github.com/vim/vim/issues/6597)